SSI Altimeter
The SSI Altimeter (also known as the "Dual Deploy Altimeter" or "Althometer") is an ongoing project to develop a low-cost, customization, and easily programmable altimeter for SSI-run rocketry certifications.
Project Status
The altimeter is currently under development. An revision 1 has been produced and is currently undergoing testing.
Accessing Source Files
Source files for the altimeter are in SSI's Subversion repository (where all Altium files are hosted). If you are an SSI member, talk with Logan Herrera or Thomas Teisberg about getting access.
The intent is to make all of the hardware open source. This will likely be done after the project has reached a stable point.